Prothermo NMT81 - Average temperature measurement

Average temperature measurement Prothermo NMT81

Precise average temperature measurement

NMT81

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Specs at a glance

Accuracy

+/- 0.032 °C (+/- 0.058 °F)
Operating temperature range

Options:
-40 °C...+75 °C
(-40 °F...+167 °F)
-40 °C...+100 °C
(-40 °F...+212 °F)
-55 °C...+235 °C
(-67 °F...+455 °F)
-196 °C...+100 °C
(-321 °F...+212 °F)
Max. immersion length on request

up to 100 m (328 ft)

See all specifications

Field of application

Prothermo NMT81 measures the average temperature of a medium and can optionally identify the water level. With an optional 2m long capacitance sensor, the water level is measured continuously delivering current water level information at any time. With its highly precise average temperature measurement, the NMT81 is perfectly suitable for custody transfer and inventory monitoring together with tank gauging such as Proservo NMS80, NMS81, NMS83, Micropilot NMR81, NMR84 and TankSideMonitor NRF81.

For precision average temperature and water bottom measurement

Process connection: Flanges from 1-1/4“

Temperature: -40 to +60°C (-40 to +140°F)

Measuring distance: 100m (328.08ft)

Total accuracy: ± 0.032°C(±0.06°F) with 5pt. temperature calibration

Conversion (transmitter) accuracy: ±0.025 °C (0.045 °F)

Sensor accuracy: ±0.02 °C (0.036 °F)

Benefits

Precise asset management thanks to up to 24 RTDs
Corrosion-resistant process parts
Minimize tank construction cost through 1-1/4” sized nozzle
Easy installation
Waterproof and dust proof housing
Reduced downtime thanks to redundant RTDs processed by a software algorithm

Xpert selection

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

Xpert: Master your most challenging applications

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

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Predecessor

Prothermo NMT539

Prothermo NMT532

Success stories

Fast-responding temperature measurement in polymerization

To meet the challenges of temperature monitoring in such critical processes, a thermowell design has been developed that responds to process changes up to five times faster than standard designs.
Read the full story
Enhanced safety in polymer production

The Ziegler-Natta process uses hazardous chemicals like titanium tetrachloride. Precise temperature measurement is crucial to prevent runaway reactions and ensure safety and efficiency.
Read the full story
iTHERM QuickSens for the optimization of mixing processes

iTHERM QuickSens for the optimization of mixing processes - Slurry mixing for the production of battery cell electrodes.
Read the full story
Temperature monitoring in hydroelectric power plants

Temperature monitoring of the air-cooling system in hydroelectric power plants - iTHERM ModuLine TST434B as the optimal solution for ambient temperature measurement
Read the full story
Temperature measurement in hydrogen production

Temperature measurement in hydrogen production with the iTHERM SurfaceLine TM611 - Non-invasive temperature measurement redefined
Read the full story

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03/07/2025
07/03/2023
26/12/2022
11/10/2021
15/02/2021

Language:	English
Version:	03/07/2025
File size:	4.3 MB
File name:	TI01590GEN_0525-00.pdf

Language:	English
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	EN
03/07/2025
07/03/2023
26/12/2022
11/10/2021
15/02/2021

Language:	English
Version:	03/07/2025
File size:	4.3 MB
File name:	TI01590GEN_0525-00.pdf

	EN
26/12/2022
07/09/2021

	EN
26/12/2022
07/09/2021

	EN
18/11/2021

	EN
28/03/2025
15/05/2023
13/01/2022
27/02/2021
31/07/2020

Average temperature measurement Prothermo NMT81

Precise average temperature measurement

Specs at a glance

Accuracy

Operating temperature range

Max. immersion length on request

Field of application

Benefits

Xpert selection

Predecessor

Success stories

Fast-responding temperature measurement in polymerization

Enhanced safety in polymer production

iTHERM QuickSens for the optimization of mixing processes

Temperature monitoring in hydroelectric power plants

Temperature measurement in hydrogen production

Measuring principle

Characteristic / Application

Max. immersion length on request

Process connection

Operating temperature range

Accuracy

Ex - approvals

Back

TI Prothermo NMT81

Prothermo NMT81

TI Prothermo NMT81

BA Prothermo NMT81

Prothermo NMT81

KA Prothermo NMT81

Main and sensor boards

EA HistoROM

C-ring

EA Dummy plug M20×1.5 G½, NPT ½, NPT ¾

EA Segment display VU100/VU101, graphical display VU112/VU113

EA Terminal module

Back

Blind plug, M20, 316L, o-ring EPDM

Blind plug, M20, Alu, o-ring EPDM

Blind plug, NPT1/2, Alu

Blind plug, NPT1/2, 316L

Cover Alu, closed, Ex d, w/o sealing

Cover Alu, sight glass, w/o sealing

Cover Alu,sight glass,Ex d, w/o sealing

Cover 316L, closed, Ex d, w/o sealing

Cover 316L,sight glass,Ex d,w/o sealing

Cover sealing FVMQ, -60oC, 5 pieces

Electronic NMT81, HART, w/o HistoROM

Sensor module, NMT81

Terminal unit TU101A, 4-20mA, OVP,L-form

Segment display VU100

C-ring, NMT81

Weather protection cover, 316L, XW112

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